OUForce.H

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License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
Class
    Foam::fv::OUForce
 
Description
    Calculates and applies the random OU (Ornstein-Uhlenbeck) process force to
    the momentum equation for direct numerical simulation of boxes of isotropic
    turbulence.
 
    The energy spectrum is calculated and written at write-times which is
    particularly useful to test and compare LES SGS models.
 
Note
    This random OU process force uses a FFT to generate the force field which
    is not currently parallelised.  Also the mesh the FFT is applied to must
    be isotropic and have a power of 2 cells in each direction.
 
Usage
    Example usage:
    \verbatim
    OUForce
    {
        type    OUForce;
 
        libs    ("librandomProcesses.so");
 
        sigma   0.090295;
        alpha   0.81532;
        kUpper  10;
        kLower  7;
    }
    \endverbatim
 
SourceFiles
    OUForce.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef OUForce_H
#define OUForce_H
 
#include "fvModel.H"
#include "Kmesh.H"
#include "OUprocess.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace fv
{
 
/*---------------------------------------------------------------------------*\
                        Class OUForce Declaration
\*---------------------------------------------------------------------------*/
 
class OUForce
:
    public fvModel
{
    // Private Data
 
        //- Name of the velocity field
        word UName_;
 
        //- The wavenumber mesh used for the random OU process
        Kmesh K_;
 
        //- The random OU process force generator
        OUprocess forceGen_;
 
 
    // Private Member Functions
 
        //- Non-virtual read
        void readCoeffs();
 
 
public:
 
    //- Runtime type information
    TypeName("OUForce");
 
 
    // Constructors
 
        //- Construct from explicit source name and mesh
        OUForce
        (
            const word& name,
            const word& modelType,
            const fvMesh& mesh,
            const dictionary& dict
        );
 
        //- Disallow default bitwise copy construction
        OUForce(const OUForce&) = delete;
 
 
    // Member Functions
 
        // Checks
 
            //- Return the list of fields for which the fvModel adds source term
            //  to the transport equation
            virtual wordList addSupFields() const;
 
 
        // Evaluate
 
            //- Add explicit contribution to incompressible momentum equation
            virtual void addSup
            (
                const volVectorField& field,
                fvMatrix<vector>& eqn
            ) const;
 
 
        // Mesh changes
 
            //- Update for mesh motion
            virtual bool movePoints();
 
            //- Update topology using the given map
            virtual void topoChange(const polyTopoChangeMap&);
 
            //- Update from another mesh using the given map
            virtual void mapMesh(const polyMeshMap&);
 
            //- Redistribute or update using the given distribution map
            virtual void distribute(const polyDistributionMap&);
 
 
        // IO
 
            //- Read source dictionary
            virtual bool read(const dictionary& dict);
 
            //- Write energy spectrum
            virtual bool write(const bool write = true) const;
 
 
    // Member Operators
 
        //- Disallow default bitwise assignment
        void operator=(const OUForce&) = delete;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace fv
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //